I have 4 of these. all at f/w 1.11
2 worked for 9 months on 2 batteries.
The other 2 would be 80% battery one day and dead within 3 more days. (the green led would be on longer than normal)
I tried factory resets, reconfigure settings. just seemed random.

I have now wired them up to a 5v external power supply.
They work well with external power.